The positive message of seeing the similarities people have beneath their exterior trappings is muted by all the violence and bad ends to which even the noblest characters come. But the film is clearly meant to look beyond filters of prejudice to see individuals' worth.
Very frequent violence of the kind typical to Westerns: guns, arrows, knives, fistfights, hanging, you name it. Blood, injuries, and the aftermath of three women being gang-raped are shown. Children, including a baby, are murdered.
A possible consensual sexual encounter is hinted at but not shown.
Appropriately for the era it takes place in, curses are mostly of the "damn" and "dammit" variety, with some use of "bastards" and "bitches" and occasional use of "f--k," "s--t," and "ass." Also many racial epithets and graphic descriptions of atrocities.
Occasional drinking. A character suffering from PTSD tries to self-medicate.